CoatingsPro Magazine

NOV 2015

CoatingsPro offers an in-depth look at coatings based on case studies, successful business operation, new products, industry news, and the safe and profitable use of coatings and equipment.

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66 NOVEMBER 2015 COATINGSPROMAG.COM moderate to light breezes can create problems when various and ultimately conficting painting operations are carried out in close proximity. Common sense can go a long way in these situations. If it looks like the breeze is carrying debris downwind in the direction of painting operations, it's pretty reasonable to assume that there will be debris in the coating flm that's just been applied. Management of the work efort in the yard would dictate that any painting operations should be performed upwind of the blasting operations. In some cases, it may be rational to move certain objects for coating operations, but the reality with large fxed structures and very large objects such as ships is that they're very difcult to move just for a painting operation. So the only recourse is to wait for the correct weather, such as a change of wind direc- tion, or to build an enclosure to control the work environment. Overspray Consequences A lthough most of this discussion has been centered on debris being blown into a coating flm during application, other issues can manifest as well when high winds are present during coating application. Te last discussion point for what the wind may be blowing during painting operations is overspray. "Unintended consequences" is the greatest description for what can happen without properly managing the work without an awareness of wind direction and the travel of overspray. So many times, we've seen overspray claims for cars painted downwind of a protective coating operation. Tis oversight with regard to management of the worksite can create signifcant and often crippling fnancial liabilities. An earlier investigation into delaminating coatings revealed that primer overspray blown onto the surface of a primed underwater hull of a vessel contributed signifcantly to the delamination of subsequent coats of material applied. Te overspray on the primer was in such density that it precluded any substantial adhesion of the subsequent coats. Te application of protective coatings is typically performed to a specifcation for that project. W hether it's a good specifcation can help to ensure the performance and longev- ity of the installed coating system by providing direction to the installation of the coating itself. It's usually human interference and/or interpretation of that specifcation that leads to and results in signifcant problems. Even if wind speed is not specifcally addressed in the project specifcation, it's a no-brainer that it can have a huge efect on the successful in situ installation of the coating flm. Te wind direction obviously takes on the greatest consideration. Te direction that it blows is the direction that will carry the abrasive blasting debris or overspray to whatever surface may be available. Without the use of enclosures, it's going to be imperative that the work is managed with a consideration of what the wind is blowing and where. One and Done Tere are so many obstacles that have to be overcome to meet the schedule and deadlines imposed for painting projects. In the thought process of developing the strategy and tactics to meet those deadlines, always be aware of the potential consequence of continuing work in a high wind, or even light to moderate wind speeds, especially when working in close proximity to other abrasive blasting and painting operations. Te best economic solution for all parties is to apply the coating one time and to do it correctly so that the installed coating system provides the intended performance and service life. CP D. Terry Greenfield is a pr incipa l consu ltant w it h Cor roMet r ics Ser v ices, Inc. Greenf ield has more t han 37 years' e x per ience in t he protect ive coat ings and cor rosion indust r y, prov id ing prog ram and project management, qua l it y assurance, cond it ion assessment and ma intenance planning , specif icat ion development, fa i lure ana lysis, e x per t w it ness, and t ra ining for t he mar ine, t ranspor ta- t ion, oi l and gas, and ot her indust r ies. Greenf ield is a g raduate of t he Universit y of Cent ra l Flor id a. He is a NACE Level III Coat ing Inspector w it h Br idge, Mar ine, and Nuc lear Specia lt ies. He hold s Of fshore and Shipboard Cor rosion A ssessment Technician cer t if icat ions, and he is a Societ y for Protect ive Coat ings (SSPC) Cer t if ied Protect ive Coat ings Specia l ist. For more infor mat ion, contact: Cor roMet r ics Ser v ices, Inc., (251) 4 45-1560, w w w.cor romet r ics.com Shown here are a ferrous blasting material as well as other deleterious substances imbedded in a coating. Coatings Failures

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